minor: fix bundle deployjar help
minor: fix bundle deployjar help

Fix outdated help for bundle deployjar.

Since https://rbcommons.com/s/twitter/r/3133/, the behavior is
- for deployjar no change, one fat jar that contains all class files, internal and 3rdparty
- for no-deployjar, it's one synthetic jar + both internal and 3rdparty jars under `libs/`

Testing Done:
https://travis-ci.org/peiyuwang/pants/builds/121580960 is running

Bugs closed: 3160

Reviewed at https://rbcommons.com/s/twitter/r/3663/

15Dkatz/pants,peiyuwang/pants,twitter/pants,wisechengyi/pants,pantsbuild/pants,dbentley/pants,manasapte/pants,UnrememberMe/pants,manasapte/pants,landism/pants,UnrememberMe/pants,gmalmquist/pants,cevaris/pants,foursquare/pants,fkorotkov/pants,UnrememberMe/pants,lahosken/pants,UnrememberMe/pants,benjyw/pants,ericzundel/pants,baroquebobcat/pants,15Dkatz/pants,kwlzn/pants,dbentley/pants,foursquare/pants,UnrememberMe/pants,mateor/pants,fkorotkov/pants,ericzundel/pants,fkorotkov/pants,manasapte/pants,foursquare/pants,ericzundel/pants,gmalmquist/pants,pantsbuild/pants,pantsbuild/pants,cevaris/pants,fkorotkov/pants,lahosken/pants,benjyw/pants,tdyas/pants,mateor/pants,landism/pants,landism/pants,lahosken/pants,foursquare/pants,tdyas/pants,baroquebobcat/pants,pombredanne/pants,gmalmquist/pants,tdyas/pants,twitter/pants,lahosken/pants,pombredanne/pants,baroquebobcat/pants,pombredanne/pants,cevaris/pants,benjyw/pants,manasapte/pants,ericzundel/pants,mateor/pants,pantsbuild/pants,pombredanne/pants,benjyw/pants,15Dkatz/pants,twitter/pants,dbentley/pants,ity/pants,landism/pants,UnrememberMe/pants,kwlzn/pants,peiyuwang/pants,15Dkatz/pants,ericzundel/pants,baroquebobcat/pants,cevaris/pants,tdyas/pants,wisechengyi/pants,ity/pants,gmalmquist/pants,jsirois/pants,tdyas/pants,manasapte/pants,peiyuwang/pants,benjyw/pants,wisechengyi/pants,kwlzn/pants,peiyuwang/pants,ericzundel/pants,kwlzn/pants,peiyuwang/pants,gmalmquist/pants,ity/pants,pombredanne/pants,ity/pants,cevaris/pants,mateor/pants,peiyuwang/pants,tdyas/pants,twitter/pants,twitter/pants,baroquebobcat/pants,fkorotkov/pants,foursquare/pants,kwlzn/pants,benjyw/pants,tdyas/pants,wisechengyi/pants,twitter/pants,foursquare/pants,ericzundel/pants,15Dkatz/pants,fkorotkov/pants,gmalmquist/pants,15Dkatz/pants,wisechengyi/pants,peiyuwang/pants,lahosken/pants,manasapte/pants,dbentley/pants,pombredanne/pants,kwlzn/pants,foursquare/pants,manasapte/pants,ity/pants,15Dkatz/pants,mateor/pants,pombredanne/pants,UnrememberMe/pants,cevaris/pants,wisechengyi/pants,twitter/pants,15Dkatz/pants,ericzundel/pants,twitter/pants,UnrememberMe/pants,benjyw/pants,baroquebobcat/pants,baroquebobcat/pants,mateor/pants,ity/pants,pantsbuild/pants,lahosken/pants,ity/pants,jsirois/pants,foursquare/pants,tdyas/pants,dbentley/pants,peiyuwang/pants,dbentley/pants,fkorotkov/pants,wisechengyi/pants,jsirois/pants,baroquebobcat/pants,fkorotkov/pants,tdyas/pants,wisechengyi/pants,UnrememberMe/pants,landism/pants,wisechengyi/pants,lahosken/pants,baroquebobcat/pants,landism/pants,twitter/pants,cevaris/pants,mateor/pants,landism/pants,lahosken/pants,mateor/pants,kwlzn/pants,dbentley/pants,pantsbuild/pants,foursquare/pants,pantsbuild/pants,landism/pants,gmalmquist/pants